A method for forming a PECVD deposited ashable hardmask (AHM) with less than 30% H content at a process temperature below 500° C., e.g., about 400° C. produces low H content hard masks having the property of high selectivity of the hard mask film to the underlying layers for successful integration of the film, and are suitable for use with 193 nm generation and below lithography schemes wherein high selectivity of the hard mask to the underlying layers is required. The low temperature, low H films are produced by use of a pulsed film hydrocarbon precursor plasma treatment that reduces the amount of hydrogen incorporated in the film and therefore drives down the etch rate of the hard mask thus increasing the selectivity. The lower temperature process also allows reduction of the overall thermal budget for a wafer.
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24. A method of forming an ashable hard mask, comprising:
providing a semiconductor device substrate in a deposition chamber;
depositing on the substrate an ashable hard mask by a plasma enhanced chemical vapor deposition (PECVD) process, the process comprising:
a process temperature of less than 500° C.,
a pulsed delivery flow of a hard mask precursor to the deposition chamber with a duty cycle of less than 100%, and a plasma treatment during a time when the precursor flow is off.
1. A method of forming an ashable hard mask, comprising:
providing a semiconductor device substrate in a deposition chamber;
depositing on the substrate an ashable hard mask film by a plasma enhanced chemical vapor deposition (PECVD) process wherein the process temperature is below 500° C. and the resulting hard mask has a hydrogen content of less than 30%, the deposition process comprising a pulsed delivery flow of a hard mask precursor to the deposition chamber with a duty cycle of less than 100%; and,
treating the deposited film with a plasma, during a time when the precursor flow is off.
28. A method of modulating hydrogen content in a deposited ashable hard mask, comprising:
determining a base ashable hard mask hydrogen concentration resulting from deposition using plasma enhanced chemical vapor deposition (PECVD) process parameters comprising a static hard mask precursor delivery flow to the deposition chamber;
providing a semiconductor device substrate in a deposition chamber; and
depositing on the substrate an ashable hard mask by the plasma enhanced chemical vapor deposition (PECVD) process altered such that the precursor delivery flow is pulsed, and the plasma power is on during a time when the precursor flow is off;
whereby the hydrogen content in the resulting deposited ashable hard mask is less than the base ashable hard mask hydrogen concentration.
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the plasma pulse frequency is synchronized with the precursor pulse frequency such that the power is lower when the precursor flow is on and higher when the precursor flow is off;
the carrier gas flow is pulse modulated in synchrony with the precursor pulse frequency such that the carrier gas flow is lower when the precursor flow is on and higher when the precursor flow is off; and
the chamber pressure is pulse modulated in synchrony with the precursor pulse frequency such that the chamber pressure is higher when the precursor flow is on and lower when the precursor flow is off.
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This invention relates to a novel method of producing ashable hard masks in semiconductor processing.
Ashable hard masks (AHM) are used as etch stop layers in semiconductor processing. Etch selectivity of AHM is influenced primarily by the incorporated concentration of hydrogen. Reducing the amount of hydrogen incorporated in the film drives down the etch rate of the hard mask, thus increasing the selectivity.
To date, known methods of producing AHM with low hydrogen (H) content (e.g., below 20%) rely on a relatively high temperature (greater than 500°) PECVD deposition process. Many PECVD reactors are not designed to withstand such high processing temperatures, however. At backend process temperatures of about 400° C. and below, films typically have a high hydrogen content (about 40%) and corresponding relatively low etch selectivity. Accordingly, it would be desirable to be able to produce a hard mask film with a low hydrogen content (e.g., less than 30%, or 20%) and high etch selectivity at a relatively low deposition temperature (below 500° C., e.g., no more than 400° C.).
The present invention addresses this need by providing a method for forming a PECVD deposited ashable hardmask (AHM) with less than 30 atomic % H content (e.g., less than 20% H content) at a process temperature below 500° C., e.g., about 400° C. Low H content hard masks produced according to the invention have the property of high selectivity of the hard mask film to the underlying layers for successful integration of the film, and are suitable for use with 193 nm generation and below lithography schemes wherein high selectivity of the hard mask to the underlying layers is required. The low temperature, low H films are produced by use of a pulsed film hydrocarbon precursor plasma treatment that reduces the amount of hydrogen incorporated in the film and therefore drives down the etch rate of the hard mask thus increasing the selectivity. The lower temperature process also allows reduction of the overall thermal budget for a wafer.
The invention provides low temperature, low H hard mask films produced by use of a pulsed film hydrocarbon precursor plasma treatment. The pulsed delivery of the precursor reduces the amount of hydrogen incorporated in the resulting film and therefore drives down the etch rate of the hard mask thus increasing the selectivity. Other deposition process parameters, including plasma power, carrier gas flow and chamber pressure, may also be pulsed or modulated. The pulse characteristics can be varied by varying the pulse repetition frequency (frequency of turning the pulse ON and OFF) and duty cycle (fraction of time during which the precursor pulse is ON). For example, for a pulse with a frequency of 0.1 Hz and duty cycle of 40%, one pulse period is 10 seconds with precursor pulse being ON for only 4 seconds. This additional pulsing can enhance the effect in certain applications. Generally, the hydrogen content of the resulting hard mask may be modulated by pulsing of the hard mask precursor delivery alone or in combination with one or more other deposition process parameters.
Deposition of an ashable hard mask by a plasma enhanced chemical vapor deposition (PECVD) process wherein the process temperature is below 500° C. and the resulting hard mask has a hydrogen content of less than 30% can be accomplished by a deposition process including a pulsed delivery flow of a hard mask precursor to the deposition chamber. The ashable hard mask is deposited on the substrate by a plasma enhanced chemical vapor deposition (PECVD) process wherein the process temperature of below 500° C. (e.g., no more than 400° C., or 300–400° C. or about 400° C.) wherein the precursor delivery flow is pulsed (i.e., has a duty cycle of less than 100%; e.g., 10 to 50%, 20 to 40%, such as 25 or 40%). The pulsed precursor delivery flow can have a frequency of between about 0.05 and 1 Hz, or about 0.09 and 0.2 Hz, or about 0.1 and 0.15 Hz, for example about 0.1 Hz.
These and other aspects and advantages of the invention are described further below and with reference to the drawings.
Reference will now be made in detail to specific embodiments of the invention. Examples of the specific embodiments are illustrated in the accompanying drawings. While the invention will be described in conjunction with these specific embodiments, it will be understood that it is not intended to limit the invention to such specific embodiments. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present invention.
Hard masks are used as etch stop layers in semiconductor processing. Ashable hard masks (AHM) have a chemical composition that allows them to be removed by a technique referred to as ashing once they have served their purpose. An ashable hard mask is generally composed of carbon & hydrogen with trace amount of on eor more dopants (e.g., Nitrogen, Fluorine, Boron, Silicon). The bonding structure in these hard masks can vary from SP2 (graphite-like) to SP3 (diamond-like) or a combination of both, depending on the deposition conditions. In a typical application, after etching, the hard mask has served its purpose and must be removed from the underlying dielectric oxide (e.g., SiO2). This is generally accomplished, at least in part, by ashing, also referred to as “plasma ashing” or “dry stripping.” Substrates with hard masks to be ashed, generally partially fabricated semiconductor wafers, are placed into a chamber under vacuum, and oxygen is introduced and subjected to radio frequency power which creates oxygen radicals (plasma). The radicals react with the hard mask to oxidize it to water, carbon monoxide, and carbon dioxide. In some instances, complete removal of the hard mask may be accomplished by following the ashing with additional wet or dry etching processes, for example when the ashable hard mask leaves behind any residue that cannot be removed by ashing alone.
Etch selectivity of AHM is influenced primarily by the incorporated concentration of hydrogen. Reducing the amount of hydrogen incorporated in the film drives down the etch rate of the hard mask, thus increasing the selectivity relative to an underlying oxide dielectric. The lower temperature process also allows reduction of the overall thermal budget for a wafer.
The present invention produces AHM with low hydrogen content (less than 30%, e.g., less than 25% or less than 20% or about 15%) for process temperatures below 500° C. (e.g., below 400° C., or 300–400° C.). Such lower process temperatures are compatible with existing semiconductor processing equipment, in particular PECVD reactors, such as Sequel™ or Vector™ reactor chambers available from Novellus Systems, Inc., San Jose, Calif. Thus, an ashable hard mask with the improved performance characteristic of increased selectivity, may be made without any hardware change.
Pulsed PECVD Deposition Process
The invention provides low temperature, low H hard mask films produced by use of a pulsed film hydrocarbon precursor plasma treatment. The pulsed delivery of the precursor reduces the amount of hydrogen incorporated in the resulting film and therefore drives down the etch rate of the hard mask thus increasing the selectivity. Other deposition process parameters, including plasma power, carrier gas flow and chamber pressure, may also be pulsed or modulated. The pulse characteristics can be varied by varying the pulse repetition frequency (frequency of turning the pulse ON and OFF) and duty cycle (fraction of time during which the precursor pulse is ON). For example, for a pulse with a frequency of 0.1 Hz and duty cycle of 40%, one pulse period is 10 seconds with precursor pulse being ON for only 4 seconds. This additional pulsing can enhance the effect in certain applications. Generally, the hydrogen content of the resulting hard mask may be modulated by pulsing of the hard mask precursor delivery alone or in combination with one or more other deposition process parameters.
Deposition of an ashable hard mask by a plasma enhanced chemical vapor deposition (PECVD) process wherein the process temperature is below 500° C. and the resulting hard mask has a hydrogen content of less than 30% can be accomplished by a deposition process including a pulsed delivery flow of a hard mask precursor to the deposition chamber. Referring to
The precursor is a generally a hydrocarbon, for example, one defined by the formula CXHY, wherein X=2 to 10 and Y=2–24. Specific examples include methane, acetylene, ethylene, propylene, butane, cyclohexane, benzene and toluene and (CH4, C2H2, C2H4, C3H6, C4H10, C6H6, C6H12 and C7H8, respectively). Ethylene is a preferred precursor in many applications.
Referring again to
Once more referring to
An aspect of the invention may also be expressed as a method of forming an ashable hard mask, the method involving providing a semiconductor device substrate in a deposition chamber, and depositing on the substrate an ashable hard mask by a plasma enhanced chemical vapor deposition (PECVD) process having a process temperature of less than 500° C. and a pulsed delivery flow of a hard mask precursor to the deposition chamber (for example, at a frequency of between about 0.05 and 1 Hz) with a duty cycle of less than 100%. The resulting hard mask has a hydrogen content of less than 30%. In a specific embodiment, the process has a process temperature of no more than about 400° C., a pulsed delivery flow of a hard mask precursor to the deposition chamber having a frequency of between about 0.05 and 1 Hz with a duty cycle of less than 50%, and the resulting hard mask has a hydrogen content of less than 20%.
In yet another aspect, the invention may also be expressed as a method of modulating hydrogen content in a deposited ashable hard mask. The method involves determining a base ashable hard mask hydrogen concentration resulting from deposition using plasma enhanced chemical vapor deposition (PECVD) process parameters comprising a static hard mask precursor delivery flow to the deposition chamber; providing a semiconductor device substrate in a deposition chamber; and depositing on the substrate an ashable hard mask by the plasma enhanced chemical vapor deposition (PECVD) process altered such that the precursor delivery flow is pulsed, for example, at a frequency of between about 0.05 and 1 Hz. The hydrogen content in the resulting deposited ashable hard mask is less than the base ashable hard mask hydrogen concentration. In a specific embodiment, the process has a process temperature of less than 500° C., e.g., no more than about 400° C., a pulsed delivery flow of a hard mask precursor to the deposition chamber having a frequency of between about 0.05 and 1 Hz with a duty cycle of less than 100%, e.g., less than 50%, and the resulting hard mask has a hydrogen content of less than 30%, e.g., less than 20%.
The other parameters for modulating process conditions described above also apply to these alternatively expressed aspects of the invention. In all aspects, the hydrogen content can be modulated by varying the number of pulses and the pulse frequency and duty cycle.
While the invention is not limited by any particular theory, it is believed that the H content in the hard mask film is reduced by breaking —CHx bonds in the film and subsequent formation of —C═C— by plasma treatment of few monolayers of as-deposited film, as is achieved by hard mask precursor pulsing in accordance with the present invention.
Apparatus
The present invention is preferably implemented in a plasma enhanced chemical vapor deposition (PECVD) reactor. Such a reactor may take many different forms. Generally, the apparatus will include one or more chambers or “reactors” (sometimes including multiple stations) that house one or more wafers and are suitable for wafer processing. Each chamber may house one or more wafers for processing. The one or more chambers maintain the wafer in a defined position or positions (with or without motion within that position, e.g. rotation, vibration, or other agitation). In one embodiment, a wafer undergoing hard mask deposition is transferred from one station to another within a reactor chamber during the process. For example, for a 2000 Å hard mask film deposition, 500 Å of film may be deposited at each of four stations in accordance with the present invention. Of course, the full film deposition may occur entirely at a single station or any fraction of the total film thickness may be deposited at any number of stations.
While in process, each wafer is held in place by a pedestal, wafer chuck and/or other wafer holding apparatus. For certain operations in which the wafer is to be heated, the apparatus may include a heater such as a heating plate. In a preferred embodiment of the invention, a Vector™ (e.g., C23 Vector) or Sequel™ (e.g., C2 Sequel) reactor, produced by Novellus Systems of San Jose, Calif., may be used to implement the invention.
Within the reactor, a wafer pedestal 518 supports a substrate 516. The pedestal typically includes a chuck, a fork, or lift pins to hold and transfer the substrate during and between the deposition and/or plasma treatment reactions. The chuck may be an electrostatic chuck, a mechanical chuck or various other types of chuck as are available for use in the industry and/or research.
The process gases are introduced via inlet 512. Multiple source gas lines 510 are connected to manifold 508. The gases may be premixed or not. Appropriate valving and mass flow control mechanisms are employed to ensure that the correct gases are delivered during the deposition and plasma treatment phases of the process. In case the chemical precursor(s) is delivered in the liquid form, liquid flow control mechanisms are employed. The liquid is then vaporized and mixed with other process gases during its transportation in a manifold heated above its vaporization point before reaching the deposition chamber.
Process gases exit chamber 500 via an outlet 522. A vacuum pump 526 (e.g., a one or two stage mechanical dry pump and/or a turbomolecular pump) typically draws process gases out and maintains a suitably low pressure within the reactor by a close loop controlled flow restriction device, such as a throttle valve or a pendulum valve.
The invention may be implemented on a multi-station or single station tool. In specific embodiments, the 300 mm Novellus Vector™ tool having a 4-station deposition scheme or the 200 mm Sequel™ tool having a 6-station deposition scheme are used. It is possible to index the wafers after every deposition and/or post-deposition plasma anneal treatment until all the required depositions and treatments are completed, or multiple depositions and treatments can be conducted at a single station before indexing the wafer. It has been shown that film stress is the same in either case. However, conducting multiple depositions/treatments on one station is substantially faster than indexing following each deposition and/or treatment.
The following examples are provided to further illustrate aspects and advantages of the present invention. These examples are provided to exemplify and more clearly illustrate aspects of the present invention and are in no way intended to be limiting.
Referring to
Precursor ON Phase | Parameter Range | ||
N2 (sccm) | 1000 | 0 to 10000 | |
C2H2 (sccm) | 900 | 0 to 10000 | |
He (sccm) | 9000 | 1000 to 20000 | |
HF Power (W) | 600 | 0 to 5000 | |
LF Power (W) | 600 | 0 to 5000 | |
Pressure (Torr) | 5 | 1 to 20 | |
Precursor ON time (sec) | 1.7 | 0 to 60 | |
Precursor OFF Phase | Parameter Range | ||
N2 | 1000 | 0 to 10000 | |
C2H2 | 0 | 0 | |
He | 9000 | 1000 to 20000 | |
HF Power | 600 | 0 to 5000 | |
LF Power | 1200 | 0 to 5000 | |
Pressure | 4 | 1 to 20 | |
Precursor OFF time (sec) | 5 | 0 to 60 | |
Referring to
Referring to
Although the foregoing invention has been described in some detail for purposes of clarity of understanding, it will be apparent that certain changes and modifications may be practiced within the scope of the appended claims. It should be noted that there are many alternative ways of implementing both the process and compositions of the present invention. Accordingly, the present embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein.
All references cited herein are incorporated by reference for all purposes.
Subramonium, Pramod, Fang, Zhiyuan, Henri, Jon
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